| /* |
| * Gadget Driver for Android |
| * |
| * Copyright (C) 2008 Google, Inc. |
| * Author: Mike Lockwood <lockwood@android.com> |
| * |
| * This software is licensed under the terms of the GNU General Public |
| * License version 2, as published by the Free Software Foundation, and |
| * may be copied, distributed, and modified under those terms. |
| * |
| * This program is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| * GNU General Public License for more details. |
| * |
| */ |
| |
| /* #define DEBUG */ |
| /* #define VERBOSE_DEBUG */ |
| |
| #include <linux/init.h> |
| #include <linux/module.h> |
| #include <linux/fs.h> |
| |
| #include <linux/delay.h> |
| #include <linux/kernel.h> |
| #include <linux/utsname.h> |
| #include <linux/platform_device.h> |
| |
| #include <linux/usb/ch9.h> |
| #include <linux/usb/composite.h> |
| #include <linux/usb/gadget.h> |
| |
| #include "gadget_chips.h" |
| |
| /* |
| * Kbuild is not very cooperative with respect to linking separately |
| * compiled library objects into one module. So for now we won't use |
| * separate compilation ... ensuring init/exit sections work to shrink |
| * the runtime footprint, and giving us at least some parts of what |
| * a "gcc --combine ... part1.c part2.c part3.c ... " build would. |
| */ |
| #include "usbstring.c" |
| #include "config.c" |
| #include "epautoconf.c" |
| #include "composite.c" |
| |
| #include "f_mass_storage.c" |
| #include "u_serial.c" |
| #include "f_acm.c" |
| #include "f_adb.c" |
| #include "f_mtp.c" |
| #include "f_accessory.c" |
| #define USB_ETH_RNDIS y |
| #include "f_rndis.c" |
| #include "rndis.c" |
| #include "u_ether.c" |
| |
| MODULE_AUTHOR("Mike Lockwood"); |
| MODULE_DESCRIPTION("Android Composite USB Driver"); |
| MODULE_LICENSE("GPL"); |
| MODULE_VERSION("1.0"); |
| |
| static const char longname[] = "Gadget Android"; |
| |
| /* Default vendor and product IDs, overridden by userspace */ |
| #define VENDOR_ID 0x18D1 |
| #define PRODUCT_ID 0x0001 |
| |
| struct android_usb_function { |
| char *name; |
| void *config; |
| |
| struct device *dev; |
| char *dev_name; |
| struct device_attribute **attributes; |
| |
| /* for android_dev.enabled_functions */ |
| struct list_head enabled_list; |
| |
| /* Optional: initialization during gadget bind */ |
| int (*init)(struct android_usb_function *, struct usb_composite_dev *); |
| /* Optional: cleanup during gadget unbind */ |
| void (*cleanup)(struct android_usb_function *); |
| |
| int (*bind_config)(struct android_usb_function *, struct usb_configuration *); |
| |
| /* Optional: called when the configuration is removed */ |
| void (*unbind_config)(struct android_usb_function *, struct usb_configuration *); |
| /* Optional: handle ctrl requests before the device is configured */ |
| int (*ctrlrequest)(struct android_usb_function *, |
| struct usb_composite_dev *, |
| const struct usb_ctrlrequest *); |
| }; |
| |
| struct android_dev { |
| struct android_usb_function **functions; |
| struct list_head enabled_functions; |
| struct usb_composite_dev *cdev; |
| struct device *dev; |
| |
| bool enabled; |
| bool connected; |
| bool sw_connected; |
| struct work_struct work; |
| }; |
| |
| static struct class *android_class; |
| static struct android_dev *_android_dev; |
| static int android_bind_config(struct usb_configuration *c); |
| static void android_unbind_config(struct usb_configuration *c); |
| |
| /* string IDs are assigned dynamically */ |
| #define STRING_MANUFACTURER_IDX 0 |
| #define STRING_PRODUCT_IDX 1 |
| #define STRING_SERIAL_IDX 2 |
| |
| static char manufacturer_string[256]; |
| static char product_string[256]; |
| static char serial_string[256]; |
| |
| /* String Table */ |
| static struct usb_string strings_dev[] = { |
| [STRING_MANUFACTURER_IDX].s = manufacturer_string, |
| [STRING_PRODUCT_IDX].s = product_string, |
| [STRING_SERIAL_IDX].s = serial_string, |
| { } /* end of list */ |
| }; |
| |
| static struct usb_gadget_strings stringtab_dev = { |
| .language = 0x0409, /* en-us */ |
| .strings = strings_dev, |
| }; |
| |
| static struct usb_gadget_strings *dev_strings[] = { |
| &stringtab_dev, |
| NULL, |
| }; |
| |
| static struct usb_device_descriptor device_desc = { |
| .bLength = sizeof(device_desc), |
| .bDescriptorType = USB_DT_DEVICE, |
| .bcdUSB = __constant_cpu_to_le16(0x0200), |
| .bDeviceClass = USB_CLASS_PER_INTERFACE, |
| .idVendor = __constant_cpu_to_le16(VENDOR_ID), |
| .idProduct = __constant_cpu_to_le16(PRODUCT_ID), |
| .bcdDevice = __constant_cpu_to_le16(0xffff), |
| .bNumConfigurations = 1, |
| }; |
| |
| static struct usb_configuration android_config_driver = { |
| .label = "android", |
| .unbind = android_unbind_config, |
| .bConfigurationValue = 1, |
| .bmAttributes = USB_CONFIG_ATT_ONE | USB_CONFIG_ATT_SELFPOWER, |
| .bMaxPower = 0xFA, /* 500ma */ |
| }; |
| |
| static void android_work(struct work_struct *data) |
| { |
| struct android_dev *dev = container_of(data, struct android_dev, work); |
| struct usb_composite_dev *cdev = dev->cdev; |
| char *disconnected[2] = { "USB_STATE=DISCONNECTED", NULL }; |
| char *connected[2] = { "USB_STATE=CONNECTED", NULL }; |
| char *configured[2] = { "USB_STATE=CONFIGURED", NULL }; |
| unsigned long flags; |
| |
| spin_lock_irqsave(&cdev->lock, flags); |
| if (cdev->config) { |
| spin_unlock_irqrestore(&cdev->lock, flags); |
| kobject_uevent_env(&dev->dev->kobj, KOBJ_CHANGE, |
| configured); |
| return; |
| } |
| if (dev->connected != dev->sw_connected) { |
| dev->sw_connected = dev->connected; |
| spin_unlock_irqrestore(&cdev->lock, flags); |
| kobject_uevent_env(&dev->dev->kobj, KOBJ_CHANGE, |
| dev->sw_connected ? connected : disconnected); |
| } else { |
| spin_unlock_irqrestore(&cdev->lock, flags); |
| } |
| } |
| |
| |
| /*-------------------------------------------------------------------------*/ |
| /* Supported functions initialization */ |
| |
| static int adb_function_init(struct android_usb_function *f, struct usb_composite_dev *cdev) |
| { |
| return adb_setup(); |
| } |
| |
| static void adb_function_cleanup(struct android_usb_function *f) |
| { |
| adb_cleanup(); |
| } |
| |
| static int adb_function_bind_config(struct android_usb_function *f, struct usb_configuration *c) |
| { |
| return adb_bind_config(c); |
| } |
| |
| static struct android_usb_function adb_function = { |
| .name = "adb", |
| .init = adb_function_init, |
| .cleanup = adb_function_cleanup, |
| .bind_config = adb_function_bind_config, |
| }; |
| |
| |
| #define MAX_ACM_INSTANCES 4 |
| struct acm_function_config { |
| int instances; |
| }; |
| |
| static int acm_function_init(struct android_usb_function *f, struct usb_composite_dev *cdev) |
| { |
| f->config = kzalloc(sizeof(struct acm_function_config), GFP_KERNEL); |
| if (!f->config) |
| return -ENOMEM; |
| |
| return gserial_setup(cdev->gadget, MAX_ACM_INSTANCES); |
| } |
| |
| static void acm_function_cleanup(struct android_usb_function *f) |
| { |
| gserial_cleanup(); |
| kfree(f->config); |
| f->config = NULL; |
| } |
| |
| static int acm_function_bind_config(struct android_usb_function *f, struct usb_configuration *c) |
| { |
| int i; |
| int ret = 0; |
| struct acm_function_config *config = f->config; |
| |
| for (i = 0; i < config->instances; i++) { |
| ret = acm_bind_config(c, i); |
| if (ret) { |
| pr_err("Could not bind acm%u config\n", i); |
| break; |
| } |
| } |
| |
| return ret; |
| } |
| |
| static ssize_t acm_instances_show(struct device *dev, |
| struct device_attribute *attr, char *buf) |
| { |
| struct android_usb_function *f = dev_get_drvdata(dev); |
| struct acm_function_config *config = f->config; |
| return sprintf(buf, "%d\n", config->instances); |
| } |
| |
| static ssize_t acm_instances_store(struct device *dev, |
| struct device_attribute *attr, const char *buf, size_t size) |
| { |
| struct android_usb_function *f = dev_get_drvdata(dev); |
| struct acm_function_config *config = f->config; |
| int value; |
| |
| sscanf(buf, "%d", &value); |
| if (value > MAX_ACM_INSTANCES) |
| value = MAX_ACM_INSTANCES; |
| config->instances = value; |
| return size; |
| } |
| |
| static DEVICE_ATTR(instances, S_IRUGO | S_IWUSR, acm_instances_show, acm_instances_store); |
| static struct device_attribute *acm_function_attributes[] = { &dev_attr_instances, NULL }; |
| |
| static struct android_usb_function acm_function = { |
| .name = "acm", |
| .init = acm_function_init, |
| .cleanup = acm_function_cleanup, |
| .bind_config = acm_function_bind_config, |
| .attributes = acm_function_attributes, |
| }; |
| |
| |
| static int mtp_function_init(struct android_usb_function *f, struct usb_composite_dev *cdev) |
| { |
| return mtp_setup(); |
| } |
| |
| static void mtp_function_cleanup(struct android_usb_function *f) |
| { |
| mtp_cleanup(); |
| } |
| |
| static int mtp_function_bind_config(struct android_usb_function *f, struct usb_configuration *c) |
| { |
| return mtp_bind_config(c, false); |
| } |
| |
| static int ptp_function_init(struct android_usb_function *f, struct usb_composite_dev *cdev) |
| { |
| /* nothing to do - initialization is handled by mtp_function_init */ |
| return 0; |
| } |
| |
| static void ptp_function_cleanup(struct android_usb_function *f) |
| { |
| /* nothing to do - cleanup is handled by mtp_function_cleanup */ |
| } |
| |
| static int ptp_function_bind_config(struct android_usb_function *f, struct usb_configuration *c) |
| { |
| return mtp_bind_config(c, true); |
| } |
| |
| static int mtp_function_ctrlrequest(struct android_usb_function *f, |
| struct usb_composite_dev *cdev, |
| const struct usb_ctrlrequest *c) |
| { |
| return mtp_ctrlrequest(cdev, c); |
| } |
| |
| static struct android_usb_function mtp_function = { |
| .name = "mtp", |
| .init = mtp_function_init, |
| .cleanup = mtp_function_cleanup, |
| .bind_config = mtp_function_bind_config, |
| .ctrlrequest = mtp_function_ctrlrequest, |
| }; |
| |
| /* PTP function is same as MTP with slightly different interface descriptor */ |
| static struct android_usb_function ptp_function = { |
| .name = "ptp", |
| .init = ptp_function_init, |
| .cleanup = ptp_function_cleanup, |
| .bind_config = ptp_function_bind_config, |
| }; |
| |
| |
| struct rndis_function_config { |
| u8 ethaddr[ETH_ALEN]; |
| u32 vendorID; |
| char manufacturer[256]; |
| bool wceis; |
| }; |
| |
| static int rndis_function_init(struct android_usb_function *f, struct usb_composite_dev *cdev) |
| { |
| f->config = kzalloc(sizeof(struct rndis_function_config), GFP_KERNEL); |
| if (!f->config) |
| return -ENOMEM; |
| return 0; |
| } |
| |
| static void rndis_function_cleanup(struct android_usb_function *f) |
| { |
| kfree(f->config); |
| f->config = NULL; |
| } |
| |
| static int rndis_function_bind_config(struct android_usb_function *f, |
| struct usb_configuration *c) |
| { |
| int ret; |
| struct rndis_function_config *rndis = f->config; |
| |
| if (!rndis) { |
| pr_err("%s: rndis_pdata\n", __func__); |
| return -1; |
| } |
| |
| pr_info("%s MAC: %02X:%02X:%02X:%02X:%02X:%02X\n", __func__, |
| rndis->ethaddr[0], rndis->ethaddr[1], rndis->ethaddr[2], |
| rndis->ethaddr[3], rndis->ethaddr[4], rndis->ethaddr[5]); |
| |
| ret = gether_setup_name(c->cdev->gadget, rndis->ethaddr, "rndis"); |
| if (ret) { |
| pr_err("%s: gether_setup failed\n", __func__); |
| return ret; |
| } |
| |
| if (rndis->wceis) { |
| /* "Wireless" RNDIS; auto-detected by Windows */ |
| rndis_iad_descriptor.bFunctionClass = |
| USB_CLASS_WIRELESS_CONTROLLER; |
| rndis_iad_descriptor.bFunctionSubClass = 0x01; |
| rndis_iad_descriptor.bFunctionProtocol = 0x03; |
| rndis_control_intf.bInterfaceClass = |
| USB_CLASS_WIRELESS_CONTROLLER; |
| rndis_control_intf.bInterfaceSubClass = 0x01; |
| rndis_control_intf.bInterfaceProtocol = 0x03; |
| } |
| |
| return rndis_bind_config(c, rndis->ethaddr, rndis->vendorID, |
| rndis->manufacturer); |
| } |
| |
| static void rndis_function_unbind_config(struct android_usb_function *f, |
| struct usb_configuration *c) |
| { |
| gether_cleanup(); |
| } |
| |
| static ssize_t rndis_manufacturer_show(struct device *dev, |
| struct device_attribute *attr, char *buf) |
| { |
| struct android_usb_function *f = dev_get_drvdata(dev); |
| struct rndis_function_config *config = f->config; |
| return sprintf(buf, "%s\n", config->manufacturer); |
| } |
| |
| static ssize_t rndis_manufacturer_store(struct device *dev, |
| struct device_attribute *attr, const char *buf, size_t size) |
| { |
| struct android_usb_function *f = dev_get_drvdata(dev); |
| struct rndis_function_config *config = f->config; |
| |
| if (size >= sizeof(config->manufacturer)) |
| return -EINVAL; |
| if (sscanf(buf, "%s", config->manufacturer) == 1) |
| return size; |
| return -1; |
| } |
| |
| static DEVICE_ATTR(manufacturer, S_IRUGO | S_IWUSR, rndis_manufacturer_show, |
| rndis_manufacturer_store); |
| |
| static ssize_t rndis_wceis_show(struct device *dev, |
| struct device_attribute *attr, char *buf) |
| { |
| struct android_usb_function *f = dev_get_drvdata(dev); |
| struct rndis_function_config *config = f->config; |
| return sprintf(buf, "%d\n", config->wceis); |
| } |
| |
| static ssize_t rndis_wceis_store(struct device *dev, |
| struct device_attribute *attr, const char *buf, size_t size) |
| { |
| struct android_usb_function *f = dev_get_drvdata(dev); |
| struct rndis_function_config *config = f->config; |
| int value; |
| |
| if (sscanf(buf, "%d", &value) == 1) { |
| config->wceis = value; |
| return size; |
| } |
| return -EINVAL; |
| } |
| |
| static DEVICE_ATTR(wceis, S_IRUGO | S_IWUSR, rndis_wceis_show, |
| rndis_wceis_store); |
| |
| static ssize_t rndis_ethaddr_show(struct device *dev, |
| struct device_attribute *attr, char *buf) |
| { |
| struct android_usb_function *f = dev_get_drvdata(dev); |
| struct rndis_function_config *rndis = f->config; |
| return sprintf(buf, "%02x:%02x:%02x:%02x:%02x:%02x\n", |
| rndis->ethaddr[0], rndis->ethaddr[1], rndis->ethaddr[2], |
| rndis->ethaddr[3], rndis->ethaddr[4], rndis->ethaddr[5]); |
| } |
| |
| static ssize_t rndis_ethaddr_store(struct device *dev, |
| struct device_attribute *attr, const char *buf, size_t size) |
| { |
| struct android_usb_function *f = dev_get_drvdata(dev); |
| struct rndis_function_config *rndis = f->config; |
| |
| if (sscanf(buf, "%02x:%02x:%02x:%02x:%02x:%02x\n", |
| (int *)&rndis->ethaddr[0], (int *)&rndis->ethaddr[1], |
| (int *)&rndis->ethaddr[2], (int *)&rndis->ethaddr[3], |
| (int *)&rndis->ethaddr[4], (int *)&rndis->ethaddr[5]) == 6) |
| return size; |
| return -EINVAL; |
| } |
| |
| static DEVICE_ATTR(ethaddr, S_IRUGO | S_IWUSR, rndis_ethaddr_show, |
| rndis_ethaddr_store); |
| |
| static ssize_t rndis_vendorID_show(struct device *dev, |
| struct device_attribute *attr, char *buf) |
| { |
| struct android_usb_function *f = dev_get_drvdata(dev); |
| struct rndis_function_config *config = f->config; |
| return sprintf(buf, "%04x\n", config->vendorID); |
| } |
| |
| static ssize_t rndis_vendorID_store(struct device *dev, |
| struct device_attribute *attr, const char *buf, size_t size) |
| { |
| struct android_usb_function *f = dev_get_drvdata(dev); |
| struct rndis_function_config *config = f->config; |
| int value; |
| |
| if (sscanf(buf, "%04x", &value) == 1) { |
| config->vendorID = value; |
| return size; |
| } |
| return -EINVAL; |
| } |
| |
| static DEVICE_ATTR(vendorID, S_IRUGO | S_IWUSR, rndis_vendorID_show, |
| rndis_vendorID_store); |
| |
| static struct device_attribute *rndis_function_attributes[] = { |
| &dev_attr_manufacturer, |
| &dev_attr_wceis, |
| &dev_attr_ethaddr, |
| &dev_attr_vendorID, |
| NULL |
| }; |
| |
| static struct android_usb_function rndis_function = { |
| .name = "rndis", |
| .init = rndis_function_init, |
| .cleanup = rndis_function_cleanup, |
| .bind_config = rndis_function_bind_config, |
| .unbind_config = rndis_function_unbind_config, |
| .attributes = rndis_function_attributes, |
| }; |
| |
| |
| struct mass_storage_function_config { |
| struct fsg_config fsg; |
| struct fsg_common *common; |
| }; |
| |
| static int mass_storage_function_init(struct android_usb_function *f, |
| struct usb_composite_dev *cdev) |
| { |
| struct mass_storage_function_config *config; |
| struct fsg_common *common; |
| int err; |
| |
| config = kzalloc(sizeof(struct mass_storage_function_config), |
| GFP_KERNEL); |
| if (!config) |
| return -ENOMEM; |
| |
| config->fsg.nluns = 1; |
| config->fsg.luns[0].removable = 1; |
| |
| common = fsg_common_init(NULL, cdev, &config->fsg); |
| if (IS_ERR(common)) { |
| kfree(config); |
| return PTR_ERR(common); |
| } |
| |
| err = sysfs_create_link(&f->dev->kobj, |
| &common->luns[0].dev.kobj, |
| "lun"); |
| if (err) { |
| kfree(config); |
| return err; |
| } |
| |
| config->common = common; |
| f->config = config; |
| return 0; |
| } |
| |
| static void mass_storage_function_cleanup(struct android_usb_function *f) |
| { |
| kfree(f->config); |
| f->config = NULL; |
| } |
| |
| static int mass_storage_function_bind_config(struct android_usb_function *f, |
| struct usb_configuration *c) |
| { |
| struct mass_storage_function_config *config = f->config; |
| return fsg_bind_config(c->cdev, c, config->common); |
| } |
| |
| static ssize_t mass_storage_inquiry_show(struct device *dev, |
| struct device_attribute *attr, char *buf) |
| { |
| struct android_usb_function *f = dev_get_drvdata(dev); |
| struct mass_storage_function_config *config = f->config; |
| return sprintf(buf, "%s\n", config->common->inquiry_string); |
| } |
| |
| static ssize_t mass_storage_inquiry_store(struct device *dev, |
| struct device_attribute *attr, const char *buf, size_t size) |
| { |
| struct android_usb_function *f = dev_get_drvdata(dev); |
| struct mass_storage_function_config *config = f->config; |
| if (size >= sizeof(config->common->inquiry_string)) |
| return -EINVAL; |
| if (sscanf(buf, "%s", config->common->inquiry_string) != 1) |
| return -EINVAL; |
| return size; |
| } |
| |
| static DEVICE_ATTR(inquiry_string, S_IRUGO | S_IWUSR, |
| mass_storage_inquiry_show, |
| mass_storage_inquiry_store); |
| |
| static struct device_attribute *mass_storage_function_attributes[] = { |
| &dev_attr_inquiry_string, |
| NULL |
| }; |
| |
| static struct android_usb_function mass_storage_function = { |
| .name = "mass_storage", |
| .init = mass_storage_function_init, |
| .cleanup = mass_storage_function_cleanup, |
| .bind_config = mass_storage_function_bind_config, |
| .attributes = mass_storage_function_attributes, |
| }; |
| |
| |
| static int accessory_function_init(struct android_usb_function *f, |
| struct usb_composite_dev *cdev) |
| { |
| return acc_setup(); |
| } |
| |
| static void accessory_function_cleanup(struct android_usb_function *f) |
| { |
| acc_cleanup(); |
| } |
| |
| static int accessory_function_bind_config(struct android_usb_function *f, |
| struct usb_configuration *c) |
| { |
| return acc_bind_config(c); |
| } |
| |
| static int accessory_function_ctrlrequest(struct android_usb_function *f, |
| struct usb_composite_dev *cdev, |
| const struct usb_ctrlrequest *c) |
| { |
| return acc_ctrlrequest(cdev, c); |
| } |
| |
| static struct android_usb_function accessory_function = { |
| .name = "accessory", |
| .init = accessory_function_init, |
| .cleanup = accessory_function_cleanup, |
| .bind_config = accessory_function_bind_config, |
| .ctrlrequest = accessory_function_ctrlrequest, |
| }; |
| |
| |
| static struct android_usb_function *supported_functions[] = { |
| &adb_function, |
| &acm_function, |
| &mtp_function, |
| &ptp_function, |
| &rndis_function, |
| &mass_storage_function, |
| &accessory_function, |
| NULL |
| }; |
| |
| |
| static int android_init_functions(struct android_usb_function **functions, |
| struct usb_composite_dev *cdev) |
| { |
| struct android_dev *dev = _android_dev; |
| struct android_usb_function *f; |
| struct device_attribute **attrs; |
| struct device_attribute *attr; |
| int err; |
| int index = 0; |
| |
| for (; (f = *functions++); index++) { |
| f->dev_name = kasprintf(GFP_KERNEL, "f_%s", f->name); |
| f->dev = device_create(android_class, dev->dev, |
| MKDEV(0, index), f, f->dev_name); |
| if (IS_ERR(f->dev)) { |
| pr_err("%s: Failed to create dev %s", __func__, |
| f->dev_name); |
| err = PTR_ERR(f->dev); |
| goto err_create; |
| } |
| |
| if (f->init) { |
| err = f->init(f, cdev); |
| if (err) { |
| pr_err("%s: Failed to init %s", __func__, |
| f->name); |
| goto err_out; |
| } |
| } |
| |
| attrs = f->attributes; |
| if (attrs) { |
| while ((attr = *attrs++) && !err) |
| err = device_create_file(f->dev, attr); |
| } |
| if (err) { |
| pr_err("%s: Failed to create function %s attributes", |
| __func__, f->name); |
| goto err_out; |
| } |
| } |
| return 0; |
| |
| err_out: |
| device_destroy(android_class, f->dev->devt); |
| err_create: |
| kfree(f->dev_name); |
| return err; |
| } |
| |
| static void android_cleanup_functions(struct android_usb_function **functions) |
| { |
| struct android_usb_function *f; |
| |
| while (*functions) { |
| f = *functions++; |
| |
| if (f->dev) { |
| device_destroy(android_class, f->dev->devt); |
| kfree(f->dev_name); |
| } |
| |
| if (f->cleanup) |
| f->cleanup(f); |
| } |
| } |
| |
| static int |
| android_bind_enabled_functions(struct android_dev *dev, |
| struct usb_configuration *c) |
| { |
| struct android_usb_function *f; |
| int ret; |
| |
| list_for_each_entry(f, &dev->enabled_functions, enabled_list) { |
| ret = f->bind_config(f, c); |
| if (ret) { |
| pr_err("%s: %s failed", __func__, f->name); |
| return ret; |
| } |
| } |
| return 0; |
| } |
| |
| static void |
| android_unbind_enabled_functions(struct android_dev *dev, |
| struct usb_configuration *c) |
| { |
| struct android_usb_function *f; |
| |
| list_for_each_entry(f, &dev->enabled_functions, enabled_list) { |
| if (f->unbind_config) |
| f->unbind_config(f, c); |
| } |
| } |
| |
| static int android_enable_function(struct android_dev *dev, char *name) |
| { |
| struct android_usb_function **functions = dev->functions; |
| struct android_usb_function *f; |
| while ((f = *functions++)) { |
| if (!strcmp(name, f->name)) { |
| list_add_tail(&f->enabled_list, &dev->enabled_functions); |
| return 0; |
| } |
| } |
| return -EINVAL; |
| } |
| |
| /*-------------------------------------------------------------------------*/ |
| /* /sys/class/android_usb/android%d/ interface */ |
| |
| static ssize_t |
| functions_show(struct device *pdev, struct device_attribute *attr, char *buf) |
| { |
| struct android_dev *dev = dev_get_drvdata(pdev); |
| struct android_usb_function *f; |
| char *buff = buf; |
| |
| list_for_each_entry(f, &dev->enabled_functions, enabled_list) |
| buff += sprintf(buff, "%s,", f->name); |
| if (buff != buf) |
| *(buff-1) = '\n'; |
| return buff - buf; |
| } |
| |
| static ssize_t |
| functions_store(struct device *pdev, struct device_attribute *attr, |
| const char *buff, size_t size) |
| { |
| struct android_dev *dev = dev_get_drvdata(pdev); |
| char *name; |
| char buf[256], *b; |
| int err; |
| |
| INIT_LIST_HEAD(&dev->enabled_functions); |
| |
| strncpy(buf, buff, sizeof(buf)); |
| b = strim(buf); |
| |
| while (b) { |
| name = strsep(&b, ","); |
| if (name) { |
| err = android_enable_function(dev, name); |
| if (err) |
| pr_err("android_usb: Cannot enable '%s'", name); |
| } |
| } |
| |
| return size; |
| } |
| |
| static ssize_t enable_show(struct device *pdev, struct device_attribute *attr, |
| char *buf) |
| { |
| struct android_dev *dev = dev_get_drvdata(pdev); |
| return sprintf(buf, "%d\n", dev->enabled); |
| } |
| |
| static ssize_t enable_store(struct device *pdev, struct device_attribute *attr, |
| const char *buff, size_t size) |
| { |
| struct android_dev *dev = dev_get_drvdata(pdev); |
| struct usb_composite_dev *cdev = dev->cdev; |
| int enabled = 0; |
| |
| sscanf(buff, "%d", &enabled); |
| if (enabled && !dev->enabled) { |
| /* update values in composite driver's copy of device descriptor */ |
| cdev->desc.idVendor = device_desc.idVendor; |
| cdev->desc.idProduct = device_desc.idProduct; |
| cdev->desc.bcdDevice = device_desc.bcdDevice; |
| cdev->desc.bDeviceClass = device_desc.bDeviceClass; |
| cdev->desc.bDeviceSubClass = device_desc.bDeviceSubClass; |
| cdev->desc.bDeviceProtocol = device_desc.bDeviceProtocol; |
| usb_add_config(cdev, &android_config_driver, |
| android_bind_config); |
| usb_gadget_connect(cdev->gadget); |
| dev->enabled = true; |
| } else if (!enabled && dev->enabled) { |
| usb_gadget_disconnect(cdev->gadget); |
| usb_remove_config(cdev, &android_config_driver); |
| dev->enabled = false; |
| } else { |
| pr_err("android_usb: already %s\n", |
| dev->enabled ? "enabled" : "disabled"); |
| } |
| return size; |
| } |
| |
| static ssize_t state_show(struct device *pdev, struct device_attribute *attr, |
| char *buf) |
| { |
| struct android_dev *dev = dev_get_drvdata(pdev); |
| struct usb_composite_dev *cdev = dev->cdev; |
| char *state = "DISCONNECTED"; |
| unsigned long flags; |
| |
| if (!cdev) |
| goto out; |
| |
| spin_lock_irqsave(&cdev->lock, flags); |
| if (cdev->config) |
| state = "CONFIGURED"; |
| else if (dev->connected) |
| state = "CONNECTED"; |
| spin_unlock_irqrestore(&cdev->lock, flags); |
| out: |
| return sprintf(buf, "%s\n", state); |
| } |
| |
| #define DESCRIPTOR_ATTR(field, format_string) \ |
| static ssize_t \ |
| field ## _show(struct device *dev, struct device_attribute *attr, \ |
| char *buf) \ |
| { \ |
| return sprintf(buf, format_string, device_desc.field); \ |
| } \ |
| static ssize_t \ |
| field ## _store(struct device *dev, struct device_attribute *attr, \ |
| const char *buf, size_t size) \ |
| { \ |
| int value; \ |
| if (sscanf(buf, format_string, &value) == 1) { \ |
| device_desc.field = value; \ |
| return size; \ |
| } \ |
| return -1; \ |
| } \ |
| static DEVICE_ATTR(field, S_IRUGO | S_IWUSR, field ## _show, field ## _store); |
| |
| #define DESCRIPTOR_STRING_ATTR(field, buffer) \ |
| static ssize_t \ |
| field ## _show(struct device *dev, struct device_attribute *attr, \ |
| char *buf) \ |
| { \ |
| return sprintf(buf, "%s", buffer); \ |
| } \ |
| static ssize_t \ |
| field ## _store(struct device *dev, struct device_attribute *attr, \ |
| const char *buf, size_t size) \ |
| { \ |
| if (size >= sizeof(buffer)) return -EINVAL; \ |
| if (sscanf(buf, "%s", buffer) == 1) { \ |
| return size; \ |
| } \ |
| return -1; \ |
| } \ |
| static DEVICE_ATTR(field, S_IRUGO | S_IWUSR, field ## _show, field ## _store); |
| |
| |
| DESCRIPTOR_ATTR(idVendor, "%04x\n") |
| DESCRIPTOR_ATTR(idProduct, "%04x\n") |
| DESCRIPTOR_ATTR(bcdDevice, "%04x\n") |
| DESCRIPTOR_ATTR(bDeviceClass, "%d\n") |
| DESCRIPTOR_ATTR(bDeviceSubClass, "%d\n") |
| DESCRIPTOR_ATTR(bDeviceProtocol, "%d\n") |
| DESCRIPTOR_STRING_ATTR(iManufacturer, manufacturer_string) |
| DESCRIPTOR_STRING_ATTR(iProduct, product_string) |
| DESCRIPTOR_STRING_ATTR(iSerial, serial_string) |
| |
| static DEVICE_ATTR(functions, S_IRUGO | S_IWUSR, functions_show, functions_store); |
| static DEVICE_ATTR(enable, S_IRUGO | S_IWUSR, enable_show, enable_store); |
| static DEVICE_ATTR(state, S_IRUGO, state_show, NULL); |
| |
| static struct device_attribute *android_usb_attributes[] = { |
| &dev_attr_idVendor, |
| &dev_attr_idProduct, |
| &dev_attr_bcdDevice, |
| &dev_attr_bDeviceClass, |
| &dev_attr_bDeviceSubClass, |
| &dev_attr_bDeviceProtocol, |
| &dev_attr_iManufacturer, |
| &dev_attr_iProduct, |
| &dev_attr_iSerial, |
| &dev_attr_functions, |
| &dev_attr_enable, |
| &dev_attr_state, |
| NULL |
| }; |
| |
| /*-------------------------------------------------------------------------*/ |
| /* Composite driver */ |
| |
| static int android_bind_config(struct usb_configuration *c) |
| { |
| struct android_dev *dev = _android_dev; |
| int ret = 0; |
| |
| ret = android_bind_enabled_functions(dev, c); |
| if (ret) |
| return ret; |
| |
| return 0; |
| } |
| |
| static void android_unbind_config(struct usb_configuration *c) |
| { |
| struct android_dev *dev = _android_dev; |
| |
| android_unbind_enabled_functions(dev, c); |
| } |
| |
| static int android_bind(struct usb_composite_dev *cdev) |
| { |
| struct android_dev *dev = _android_dev; |
| struct usb_gadget *gadget = cdev->gadget; |
| int gcnum, id, ret; |
| |
| usb_gadget_disconnect(gadget); |
| |
| ret = android_init_functions(dev->functions, cdev); |
| if (ret) |
| return ret; |
| |
| /* Allocate string descriptor numbers ... note that string |
| * contents can be overridden by the composite_dev glue. |
| */ |
| id = usb_string_id(cdev); |
| if (id < 0) |
| return id; |
| strings_dev[STRING_MANUFACTURER_IDX].id = id; |
| device_desc.iManufacturer = id; |
| |
| id = usb_string_id(cdev); |
| if (id < 0) |
| return id; |
| strings_dev[STRING_PRODUCT_IDX].id = id; |
| device_desc.iProduct = id; |
| |
| /* Default strings - should be updated by userspace */ |
| strncpy(manufacturer_string, "Android", sizeof(manufacturer_string) - 1); |
| strncpy(product_string, "Android", sizeof(product_string) - 1); |
| strncpy(serial_string, "0123456789ABCDEF", sizeof(serial_string) - 1); |
| |
| id = usb_string_id(cdev); |
| if (id < 0) |
| return id; |
| strings_dev[STRING_SERIAL_IDX].id = id; |
| device_desc.iSerialNumber = id; |
| |
| gcnum = usb_gadget_controller_number(gadget); |
| if (gcnum >= 0) |
| device_desc.bcdDevice = cpu_to_le16(0x0200 + gcnum); |
| else { |
| /* gadget zero is so simple (for now, no altsettings) that |
| * it SHOULD NOT have problems with bulk-capable hardware. |
| * so just warn about unrcognized controllers -- don't panic. |
| * |
| * things like configuration and altsetting numbering |
| * can need hardware-specific attention though. |
| */ |
| pr_warning("%s: controller '%s' not recognized\n", |
| longname, gadget->name); |
| device_desc.bcdDevice = __constant_cpu_to_le16(0x9999); |
| } |
| |
| usb_gadget_set_selfpowered(gadget); |
| dev->cdev = cdev; |
| |
| return 0; |
| } |
| |
| static int android_usb_unbind(struct usb_composite_dev *cdev) |
| { |
| struct android_dev *dev = _android_dev; |
| |
| cancel_work_sync(&dev->work); |
| android_cleanup_functions(dev->functions); |
| return 0; |
| } |
| |
| static struct usb_composite_driver android_usb_driver = { |
| .name = "android_usb", |
| .dev = &device_desc, |
| .strings = dev_strings, |
| .unbind = android_usb_unbind, |
| }; |
| |
| static int |
| android_setup(struct usb_gadget *gadget, const struct usb_ctrlrequest *c) |
| { |
| struct android_dev *dev = _android_dev; |
| struct usb_composite_dev *cdev = get_gadget_data(gadget); |
| struct usb_request *req = cdev->req; |
| struct android_usb_function *f; |
| int value = -EOPNOTSUPP; |
| unsigned long flags; |
| |
| req->zero = 0; |
| req->complete = composite_setup_complete; |
| req->length = 0; |
| gadget->ep0->driver_data = cdev; |
| |
| list_for_each_entry(f, &dev->enabled_functions, enabled_list) { |
| if (f->ctrlrequest) { |
| value = f->ctrlrequest(f, cdev, c); |
| if (value >= 0) |
| break; |
| } |
| } |
| |
| /* Special case the accessory function. |
| * It needs to handle control requests before it is enabled. |
| */ |
| if (value < 0) |
| value = acc_ctrlrequest(cdev, c); |
| |
| if (value < 0) |
| value = composite_setup(gadget, c); |
| |
| spin_lock_irqsave(&cdev->lock, flags); |
| if (!dev->connected) { |
| dev->connected = 1; |
| schedule_work(&dev->work); |
| } |
| else if (c->bRequest == USB_REQ_SET_CONFIGURATION && cdev->config) { |
| schedule_work(&dev->work); |
| } |
| spin_unlock_irqrestore(&cdev->lock, flags); |
| |
| return value; |
| } |
| |
| static void android_disconnect(struct usb_gadget *gadget) |
| { |
| struct android_dev *dev = _android_dev; |
| struct usb_composite_dev *cdev = get_gadget_data(gadget); |
| unsigned long flags; |
| |
| composite_disconnect(gadget); |
| |
| spin_lock_irqsave(&cdev->lock, flags); |
| dev->connected = 0; |
| schedule_work(&dev->work); |
| spin_unlock_irqrestore(&cdev->lock, flags); |
| } |
| |
| static int android_create_device(struct android_dev *dev) |
| { |
| struct device_attribute **attrs = android_usb_attributes; |
| struct device_attribute *attr; |
| int err; |
| |
| dev->dev = device_create(android_class, NULL, |
| MKDEV(0, 0), NULL, "android0"); |
| if (IS_ERR(dev->dev)) |
| return PTR_ERR(dev->dev); |
| |
| dev_set_drvdata(dev->dev, dev); |
| |
| while ((attr = *attrs++)) { |
| err = device_create_file(dev->dev, attr); |
| if (err) { |
| device_destroy(android_class, dev->dev->devt); |
| return err; |
| } |
| } |
| return 0; |
| } |
| |
| |
| static int __init init(void) |
| { |
| struct android_dev *dev; |
| int err; |
| |
| android_class = class_create(THIS_MODULE, "android_usb"); |
| if (IS_ERR(android_class)) |
| return PTR_ERR(android_class); |
| |
| dev = kzalloc(sizeof(*dev), GFP_KERNEL); |
| if (!dev) |
| return -ENOMEM; |
| |
| dev->functions = supported_functions; |
| INIT_LIST_HEAD(&dev->enabled_functions); |
| INIT_WORK(&dev->work, android_work); |
| |
| err = android_create_device(dev); |
| if (err) { |
| class_destroy(android_class); |
| kfree(dev); |
| return err; |
| } |
| |
| _android_dev = dev; |
| |
| /* Override composite driver functions */ |
| composite_driver.setup = android_setup; |
| composite_driver.disconnect = android_disconnect; |
| |
| return usb_composite_probe(&android_usb_driver, android_bind); |
| } |
| module_init(init); |
| |
| static void __exit cleanup(void) |
| { |
| usb_composite_unregister(&android_usb_driver); |
| class_destroy(android_class); |
| kfree(_android_dev); |
| _android_dev = NULL; |
| } |
| module_exit(cleanup); |